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Flash Flood in Scott County, Illinois

Flash Flood June 25, 2021 – June 26, 2021 · Scott County, Illinois

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Several roads were flooded south of Winchester and a van was submerged in high water on Route 67 west of Manchester.

The wider storm

A series of disturbances tracking along a nearly stationary frontal boundary resulted in two periods of heavy rainfall across parts of central Illinois on June 25th and June 26th. The hardest hit areas were across southern McLean County into far northern Logan County, as well as across southern portions of Scott and Morgan counties. The first wave of heavy rain began around 7pm CDT June 25th and persisted until around 11pm that evening before tapering off. Rainfall amounts across southern McLean County ranged from 4 to 7 inches in 4 hours, with the heaviest rain extending from near the town of McLean through Bloomington-Normal southeastward toward LeRoy. The second wave of heavy rain occurred during the afternoon of June 26th when additional amounts of 2 to 4 inches fell across the same areas of southern McLean County that had been impacted the previous evening. Storm total rainfall between 6pm CDT June 25th and 6pm CDT June 26th ranged from 6 to 11 inches across southern McLean County, with a maximum amount of 10.71 inches measured 1.5 miles east-southeast of Bloomington...which represented a 1,000-year rainfall (0.1 percent chance of occurring in any given year). Locations from Funks Grove through Shirley to southern and eastern parts of Bloomington experienced a 500-year rainfall (0.2 percent chance of occurring in any given year). Due to the tremendous amount of rainfall, significant flash flooding occurred across central and southern McLean County into far northern Logan County, including the city of Bloomington. Numerous roads were closed due to high water, several water rescues needed to be performed due to stranded motorists, part of the I-55 shoulder collapsed near Kickapoo Creek, and Kickapoo Creek reached record levels and flooded several homes in Lawndale in far northern Logan County.

Began near Neelys (39.6417, -90.5219).

Source: NOAA Storm Events Database, event 962036. Narratives are written by the National Weather Service forecast office that issued the report.

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